LDS3985 ST Microelectronics, Inc., LDS3985 Datasheet

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LDS3985

Manufacturer Part Number
LDS3985
Description
Ultra LOW Drop-low Noise Bicmos 300ma V.reg. FOR USE WITH VERY LOW ESR Output Capacitor
Manufacturer
ST Microelectronics, Inc.
Datasheet

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DESCRIPTION
The LDS3985 provides up to 300mA, from 2.5V to
6V input voltage.
Figure 1: Schematic Diagram
December 2004
INPUT VOLTAGE FROM 2.5V TO 6V
STABLE WITH LOW ESR CERAMIC
CAPACITORS
ULTRA LOW DROPOUT VOLTAGE (150mV
TYP. AT 300mA LOAD, 0.4mV TYP. AT 1mA
LOAD)
VERY LOW QUIESCENT CURRENT (85µA
TYP. AT NO LOAD, 200µA TYP. AT 300mA
LOAD; MAX 1.5µA IN OFF MODE)
GUARANTEED OUTPUT CURRENT UP TO
300mA
WIDE RANGE OF OUTPUT VOLTAGE:
1.25V; 1.35; 1.5V; 1.8V; 2V; 2.1V; 2.2V; 2.5V;
2.6V; 2.7V; 2.8V; 2.85V; 2.9V; 3V; 3.1V; 3.2V;
3.3V; 4.7V
FAST TURN-ON TIME: TYP. 240µs
[C
LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
INTERNAL CURRENT AND THERMAL LIMIT
OUTPUT LOW NOISE VOLTAGE 30µV
OVER 10Hz to 100KHz
S.V.R. OF 55dB AT 1KHz, 50dB AT 10KHz
TEMPERATURE RANGE: -40°C TO 125°C
O
=2.2µF, C
ULTRA LOW DROP-LOW NOISE BICMOS 300mA V.REG.
FOR USE WITH VERY LOW ESR OUTPUT CAPACITOR
BYP
= 33nF AND I
O
=1mA]
RMS
It is stable with ceramic and high quality tantalum
capacitor.
quiescent current and low noise makes it suitable
for low power applications and in battery powered
systems. Regulator ground current increases only
slightly in dropout, further prolonging the battery
life. Shutdown Logic Control function is available,
this means that when the device is used as local
regulator, it is possible to put a part of the board in
standby, decreasing the total power consumption.
Typical applications are in mobile phone and
similar
portable information appliances.
battery
DFN6
The
ultra
powered
low drop-voltage, low
Rev. 1
wireless
LDS3985
SERIES
SOT23-5L
systems,
1/13

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LDS3985 Summary of contents

Page 1

... OUTPUT LOW NOISE VOLTAGE 30µV OVER 10Hz to 100KHz S.V.R. OF 55dB AT 1KHz, 50dB AT 10KHz TEMPERATURE RANGE: -40°C TO 125°C DESCRIPTION The LDS3985 provides up to 300mA, from 2. input voltage. Figure 1: Schematic Diagram December 2004 It is stable with ceramic and high quality tantalum capacitor. ...

Page 2

... LDS3985M28R LDS3985M285R (*) LDS3985M29R LDS3985M30R (*) LDS3985M31R (*) LDS3985M32R (*) LDS3985M33R LDS3985M47R (*) LDS3985M48R (*) LDS3985M49R (*) LDS3985M50R (*) (*) Available on request. 2/13 Parameter SOT23-5L DFN6 LDS3985PM12R (*) LDS3985PM13R (*) LDS3985PM15R (*) LDS3985PM18R LDS3985PM20R (*) LDS3985PM21R (*) LDS3985PM22R (*) LDS3985PM25R LDS3985PM26R (*) LDS3985PM27R (*) LDS3985PM28R LDS3985PM285R (*) LDS3985PM29R (*) LDS3985PM30R (*) LDS3985PM31R (*) LDS3985PM32R (*) LDS3985PM33R LDS3985PM47R (*) LDS3985PM48R (*) LDS3985PM49R (*) LDS3985PM50R (*) Value -0 (*) -0 +0 ...

Page 3

... Common Ground Inhibit Input Voltage: ON MODE when V INH 0.4V (Do not leave floating, not internally pulled down/up) Bypass Pin: Connect an external capacitor (usually 10nF) to minimize noise voltage Output Voltage of the LDO O Not Connect. LDS3985 SERIES DFN6 Name and Function 1.2V, OFF MODE when V INH INH 3/13 ...

Page 4

... LDS3985 SERIES Table 5: Electrical Characteristics For LDS3985 ( 33nF 1mA, V BYP O INH Symbol Parameter V Operating Input Voltage I V Output Voltage < 2. Output Voltage 2. Line Regulation (Note Load Regulation O V Load Regulation O V Output AC Line Regulation O (Note 2) I Quiescent Current ...

Page 5

... TYPICAL PERFORMANCE CHARACTERISTICS ( 33nF 1mA, V BYP O INH Figure 4: Output Voltage vs Temperature Figure 5: Output Voltage vs Temperature Figure 6: Output Voltage vs Temperature = 25° 1.4V, unless otherwise specified) Figure 7: Shutdown Voltage vs Temperature Figure 8: Shutdown Voltage vs Temperature Figure 9: Line Regulation vs Temperature LDS3985 SERIES = V +0.5V O(NOM 2 5/13 ...

Page 6

... LDS3985 SERIES Figure 10: Line Regulation vs Temperature Figure 11: Line Regulation vs Temperature Figure 12: Quiescent Current vs Temperature 6/13 Figure 13: Quiescent Current vs Temperature Figure 14: Quiescent Current vs Temperature Figure 15: Supply Voltage Rejection vs Frequency ...

Page 7

... Figure 16: Dropout Voltage vs Temperature Figure 17: Dropout Voltage vs Output Current LDS3985 SERIES Figure 18: Inhibit Transient 1mA 1.2V INH 10nF 1µs BYP (cer), O 7/13 ...

Page 8

... LDS3985 SERIES DIM. MIN. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2. 2.60 L 0.10 8/13 SOT23-5L MECHANICAL DATA mm. TYP MAX. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 0.95 3.00 0.60 . mils MIN. TYP. 35.4 0.0 35.4 13.7 3.5 110.2 59.0 37.4 102.3 3.9 7049676C MAX. 57.1 3.9 51.2 19.7 7.8 118.1 68.8 118.1 23.6 ...

Page 9

... DFN6 (3x3) MECHANICAL DATA DIM. MIN 0.33 D 2.90 D2 1.92 E 2. 0.20 mm. TYP MAX. 1.00 0.05 0.75 0.20 0.43 3.00 3.10 114.2 2.12 3.00 3.10 114.2 1.31 0.95 0.45 0.24 0.13 LDS3985 SERIES inch MIN. TYP. 31.5 0.0 25.6 7.9 13.0 118.1 75.6 118.1 43.7 37.4 7.9 9.4 7.9 7387339A MAX. 39.4 2.0 29.5 16.9 122.0 83.5 122.0 51.6 17.7 5.1 9/13 ...

Page 10

... LDS3985 SERIES Tape & Reel SOT23-xL MECHANICAL DATA DIM. MIN 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 10/13 mm. TYP MAX. 180 13.0 13.2 0.504 0.795 2.362 14.4 3.23 3.33 0.123 3.17 3.27 0.120 1.37 1.47 0.050 4.0 4.1 0.153 4.0 4.1 0.153 inch MIN. TYP. 0.512 0.127 0.124 0.054 0.0.58 0.157 0.157 MAX. 7.086 0.519 0.567 0.131 ...

Page 11

... Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA DIM. MIN 12 mm. TYP MAX. 330 13.2 0.504 0.795 2.362 18.4 3.3 3.3 1 LDS3985 SERIES inch MIN. TYP. 12.992 0.130 0.130 0.043 0.157 0.315 MAX. 0.519 0.724 11/13 ...

Page 12

... LDS3985 SERIES Table 6: Revision History Date Revision 02-Dic-2004 1 12/13 Description of Changes First Release. ...

Page 13

... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America All other names are the property of their respective owners © 2004 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies www.st.com LDS3985 SERIES 13/13 ...

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